Bond strength tests on deformed reinforcement in normal weight concrete

The primary aim of the research which is described in this paper was to investigate the effect of lateral pressure on the bond strength of deformed reinforcement set in normal weight concrete. A large number of tests was undertaken in which the main variables affecting bond strength were investigated. These included concrete strength, reinforcing bar diameter, concrete cover, lateral pressure, position of casting and bar spacing. A brief review of the small number of earlier investigations involving lateral pressures is provided. The paper provides details of the test specimens, the test apparatus and procedure, as well as typical results selected from approximately three hundred results. It draws conclusions on the appropriateness of the test method and the effects of the variables on the bond stress ratio and on bond strength.